On the temperature dependence of H-U iso in the riding hydrogen model

Lübben, Jens; Volkmann, Christian; Grabowsky, Simon; Edwards, Alison; Morgenroth, Wolfgang; Fabbiani, Francesca P. A.; Sheldrick, George M.; Dittrich, Birger (2014). On the temperature dependence of H-U iso in the riding hydrogen model. Acta Crystallographica Section A Foundations and Advances, 70(4), pp. 309-316. International Union of Crystallography 10.1107/S2053273314010626

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The temperature dependence of H-Uiso in N-acetyl-L-4-hydroxyproline monohydrate is investigated. Imposing a constant temperature-independent multiplier of 1.2 or 1.5 for the riding hydrogen model is found to be inaccurate, and severely underestimates H-Uiso below 100 K. Neutron diffraction data at temperatures of 9, 150, 200 and 250 K provide benchmark results for this study. X-ray diffraction data to high resolution, collected at temperatures of 9, 30, 50, 75, 100, 150, 200 and 250 K (synchrotron and home source), reproduce neutron results only when evaluated by aspherical-atom refinement models, since these take into account bonding and lone-pair electron density; both invariom and Hirshfeld-atom refinement models enable a more precise determination of the magnitude of H-atom displacements than independent-atom model refinements. Experimental efforts are complemented by computing displacement parameters following the TLS+ONIOM approach. A satisfactory agreement between all approaches is found.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Departement of Chemistry and Biochemistry

UniBE Contributor:

Grabowsky, Simon

Subjects:

500 Science > 570 Life sciences; biology
500 Science > 540 Chemistry

ISSN:

2053-2733

Publisher:

International Union of Crystallography

Language:

English

Submitter:

Simon Grabowsky

Date Deposited:

05 Feb 2020 16:09

Last Modified:

05 Feb 2020 16:09

Publisher DOI:

10.1107/S2053273314010626

BORIS DOI:

10.7892/boris.138475

URI:

https://boris.unibe.ch/id/eprint/138475

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